Recently, university investigators25 in Cuernavaca, Mexico have been experimenting with human urine as a source of nitrogen in organic vegetable production. The experiments have compared human urine versus a control on the production of chard, celery and beets. Although the testing is not complete, the results indicate better yields in the urine-fertilised vegetables compared to the control, and no diseases or pests have been found.
Ecological sanitation is also in place in El Salvador and Guatemala with thousands of units. In El Salvador, there is less interest at this time for recycling human excreta, partly because of lack of perceived space to grow food, but inhabitants in Hermosa Provincia have moved urinediverting toilets into their homes after realising that there are no smells or flies.